POST UTME JOSEPH AYO BABALOLA UNIVERSITY 2021 Chemistry | Objective
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Question 1
A 1.0 L flask contains 0.25 mol of an ideal gas at 37°C. Calculate the pressure of the gas u\sing the ideal gas law.
Question 2
A diagram shows a titration setup with a burette containing a solution of sodium hydroxide (NaOH) and a flask containing a solution of hydrochloric acid (HCl). The diagram shows that the burette contains 25.0 mL of NaOH solution. If 10.0 mL of HCl solution is added to the flask, what is the new volume of NaOH solution in the burette?
Question 3
A 1.00-mol sample of CO2 is collected over water at 25°C and 1 atm. If the partial pressure of CO2 is 0.800 atm, what is the mole \fraction of CO2 in the gas mixture?
Question 4
The atomic radius of an element increases down a group in the periodic table due to the addition of new energy levels. However, the atomic radius of an element decreases across a period due to the increase in effective nuclear charge. Which of the following elements has the largest atomic radius?
Question 5
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of CaCO3(s) if the s\tandard enthalpy of formation of CaO(s) is -635.09 kJ/mol and that of C(s) is 0 kJ/mol.
Question 6
A 1.00-mol sample of H2 is mixed with 1.00 mol of O2 in a 1.00-L container at 25°C. What is the partial pressure of H2 in the gas mixture?
Question 7
A diagram shows a simple black and white chemistry apparatus showing a distillation setup. The diagram shows that the distillation flask contains a solution of ethanol (C2H5OH) and the condenser contains a solution of water (H2O). If 50.0 mL of ethanol solution is distilled, what is the new volume of ethanol solution in the distillation flask?
Question 8
The reaction of 2.0 g of sodium with 1.0 g of chlorine produces 2.0 g of sodium chloride. Determine the limiting reac\tant.
Question 9
A sample of nitrogen gas is collected over water at 25°C and 1 atm. The partial pressure of water vapor is 0.0313 atm. What is the mole \fraction of nitrogen gas in the sample?
Question 10
A diagram shows a simple black and white chemistry apparatus showing a titration setup. The diagram shows that the burette contains a solution of sodium hydroxide (NaOH) and the flask contains a solution of hydrochloric acid (HCl). If 20.0 mL of NaOH solution is added to the flask, what is the new volume of NaOH solution in the burette?
Question 11
Determine the s\tandard enthalpy of formation of CaCO3(s) from the following data: ΔHf(CaO(s)) = -635.09 kJ/mol, ΔHf(CO2(g)) = -393.51 kJ/mol. Assume the reaction is: CaO(s) + CO2(g) → CaCO3(s).
Question 12
A 0.500 M solution of NaOH is mixed with 0.500 M HCl. What is the pH of the resulting solution?
Question 13
The s\tandard enthalpy of formation of CaO(s) is -635.09 kJ/mol. Calculate the s\tandard enthalpy of formation of CO2(g) if the s\tandard enthalpy of formation of CaCO3(s) is -1207.59 kJ/mol and that of C(s) is 0 kJ/mol.
Question 14
A 2.0 g sample of a compound containing only carbon and hydrogen is burned in oxygen and produces 2.4 L of CO2 at 25°C and 1 atm. What is the empirical formula of the compound?
Question 15
Determine the s\tandard enthalpy of formation of CaO(s) from the following data: ΔHf(Ca)=-178.2 kJ/mol, ΔHf(O)=0 kJ/mol, ΔHf(CaO)=?
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